Rice huller and polisher



(No Model.) 2 Sheets-Sheet 1.

W. S. MALLARD. RIGBHULLBR AND POLISHER.

No. 425,683. Patented'Apr. 15, 1890.

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(No Model.) 4 2 Sheets-Sheet 2. W. S. MALLARD.

f MGE HULLER AND PGLISHER. No. 425,683. Patented Apr. 15, 1890.

By m

. v a. A

, ATTURNEY UNITED STATES VILLIAM S. MALLARD,

PATENT OFFICE,

OF DARIEN, GEORGIA.

RICE HULLER AND POLISHER.

SPECIFICATION forming part of Letters Patent No. 425,683, dated April 15, 1890.

Application led September 2, 1889.

To all whom, t may concern,.-

Be it known that l, WILLIAM S. MALLARD, of Darien, in the county of McIntosh and State of Georgia, have invented a ncw and useful Improvement in Rice Hullers and Polishers, of which the following is 'a specification.

My invention consists in a new and improved rice huller and polisher, which will be hereinafter fully described and claimed.

Referring to the accompanying drawings, Figure 1 is a perspective view of my improvement. Fig. 2 is a horizontal sectionI on the line 2 2, Fig. 1. Fig. 3 is a detail vertical section on the line 3 3, Fig. 2. Fig. 4 isa detail view of a series of the hulling-plates.

The same numerals of reference indicate corresponding parts in all the iigures.

Referring to the several parts by their designating-numerals, 1 indicates t-he outer supporting-frame of my ricehuller and polisher. WVithin this frame is mounted the mortar, which may be made of either wood or iron, and which is divided centrally and vertically, being formed in two halves-the stationary half 2 and the movable half 3-the two halves being hinged together at their upper ends by the hinges 4:. The stationary half 2 has projections 5, which t into recesses 6 in the lower end of the hinged half 3 and assist in holding the two halves ofl the mortar exactly together.

Tol the sides of the stationary half 2 are secured metal clamping-arms 7, which when the mortar is closed extend on each side of the movable half 3, and the projecting ends of the arms 7 are formed with the openings 8. The halves of the mortar are held together by a clampingbar 9, the ends of which are slipped through the end openings 8 of the arms '7, as shown, and which has a central clamping-screw 10, which is tightened to bind or lock the halves of the mortar together. Vhen the mortar is made of wood, a metal bearing-plate 11 is secured to the side of the movable half 3, against which the inner end of the clamping-screw 10 bears.

12 indicates a vertical revolving shaft,

which carries the hulling and polishing plates at its lower end and has at its upper end a bevel-wheel 13, which meshes with a bevelwheel 14 on the center of a transverse shaft 15, which has on its end a` band-wheel to re- Serial No. 322,773. (No model.)

ceive a belt from any suitable source of power, by which arrangement the shaft 12 is rotated. The lower part of the shaft 12 is reduced in size and threaded, and upon this reduced lower part of the shaft are secured a series of plates 1G, which form the hulling and polishing screw. These plates 16 may be made of iron7 steel, wood, or stone, (millstone,) and are formed each with. a central aperture 17, and the half of the 'blade to each side of this central aperture is formed with the nearly straight rear edge 1S and the curved 0r concave forward edge 19, as most clearly shown in the detail view, Fig. 4. The plates 16 are placed upon the lower part of the shaft and adjusted so that each plate is at a slightly different angle from the plate nextto it, overlapping each other and forming a spiral 0r screw, as clearly shown, the plates being clamped between two nuts 2O 21, one below and one above them. The plates 1G decrease in length near the bottom of the screw, and the concavity of t-he front edges 19 of the plates decreases from the uppermost plate going down, the front edges 19 of the lowermost plates being convex, as shown in Fig. 4, which clearly shows the above arrangement.

In operation the rice enters the upper end of the mortar from a spout or chute, and is there subjected to the friction of the revolving screw formed by the many plates 1G, which work the grain down to the bottom of the mortar, and from there the rice rises up the sides of the mortar, as the screw revolves, and falls back into the screw, and this process is repeated until the rice has been treated sufficiently.

My invention will remove the outer hull and also remove the cuticle or inner skin and Apolish the rice, being more particularly intended for the latter purposes.

The process being completed, the clampingbar 9 is removed and the movable half 3 of the hopper swung out at its lower end, when the rice falls into a conveyer-trough 22 and is taken to the fans and separator.

The plates 16, composing the screw, can be turned or adj-usted on the shaft by loosening the nuts 2O 21 to regulate the pitch of the screw as may be desired.

The pressure and friction exerted on the grain can be regulated by regulating the ICO in spiral form on the'revolving shaft, sub-l stantially as set forth.

2. In a rice huller and polisher, the combi nation, with a mortar, of the revolving shaft having the threaded lower end, the upper and lower clamping-nuts 2O 21, and the series of separatelyadjustable plates 16, formed with the concave forward edges 19 and the een tral apertures 17 and arranged adjustably in spiral form on the revolving shaft, substantially as set forth.

. 3. In a rice huller and polisher, the combination of the mortar having the rounded lower end, the revolving shaft' having the threaded lower end, the upper and lower clamping-nuts, and the series of separate adjustable plates 16, of different graduated lengths, arranged in a spiral on the revolving shaft, substantially as set forth.

4. In a rice huller and polisher, the combination of the supporting-frame l, the mortar consisting of the stationary and the movable halves hinged together at their upper ends, the clamping-arms 7,11aving the end openings 8, the clamping-bar having the central clamping-screw, the conveyer-trough 22, the revolving shaft having the threaded lower end, the

plates 16, having the central apertures, and 4o the clamping-nutsQOY 21, substantially as Set forth.

WILLIAM S. MALLART). Witnesses: I

M. D. DUNWADY, P. W. BREWSTER. 

